SY20-0888-1_VM370_Rel_5_Vol_3_Dec77.pdf
Page3-35(43 of 89)
AXS Task DMTAXS VM/370 Spool File System REX Task DMTCRE Create System Service and Line Driver Tasks. DMTMGX Process Messages: • Build the Final Message Element. • Transmit File Message DMTCMX Process Commands: • Execute DMTCMX Commands • Pass Command Elements to AXS and Line Drivers for Execution. Line Driver Tasks A ... DMTREX • Handle all REX Requests • Handle Program A. '--- Check Interrupts ..---- • Handle Console I/O • Terminate System Service and Line Driver Tasks l/--- N "I Supervisor Routines Figure 14. program Organization for REX System Service Tasks RSCS Method of Operation and Program Organization BSC Line BSC Line 3-35
Figure 15. AXS Task (Mooule DMTAXS) CMDPROC • Reorder Files by Recording the TAGs queued to a Given Line Driver • Purge Files From RSCS • Change the Attributes Associated with an RSCS File Open and Close Input and Output Files Accept Files from VM/378 Spoel System REX Task I DMTMSG I Line Driver Tasks AXSCYCLE ACCEPT: I DMTMGX I • Files Spooled by Other Tasks I DMTREX I • Order, Change Purge Command Elements • Requests to I DMTCRE I Open and Close VM/370 Spool Files. I DMTCMX I Supervisor Routines Prograa organization for the lIS Service Task 3-36 IBM VM/370: System Logic and Problem Deter.ination--Voluae 3 BSC Line BSC Line